Table 3.
Diagnostic categories of thyroid FNAC according to variant of PTC
| FNAC diagnostic category | Variants of PTC in final diagnosis |
|||||
|---|---|---|---|---|---|---|
| Conventional | NIFTP | Invasive encapsulated follicular variant | Infiltrative follicular variant | Tall cell variant | Other rare variants | |
| Non-diagnostic | 32 (2.2) | 1 (4.0) | 4 (8.8) | 5 (7.7) | 3 (2.8) | 2 (11.8) |
| Benign | 6 (0.4) | 5 (20.0) | 4 (8.8) | 1 (1.6) | 0 | 0 |
| AUS | 144 (10.0) | 14 (56.0) | 17 (37.8) | 25 (40.3) | 8 (7.5) | 3 (17.6) |
| AUS-NA | 135 (9.3) | 9 (36.0) | 11 (24.4) | 21 (33.9) | 7 (6.6) | 2 (11.8) |
| AUS-MF | 3 (0.2) | 5 (20.0) | 5 (11.1) | 4 (6.4) | 0 | 0 |
| AUS-HC | 0 | 0 | 0 | 0 | 0 | 0 |
| AUS-others | 6 (0.4) | 0 | 1 (2.2) | 0 | 1 (0.9) | 1 (5.9) |
| Follicular neoplasm | 0 | 2 (8.0) | 2 (8.3) | 1 (1.6) | 0 | 0 |
| Suspicious for malignancy | 339 (23.5) | 3 (12.0) | 10 (4.4) | 14 (22.6) | 20 (18.9) | 1 (5.9) |
| Malignant | 924 (63.9) | 0a | 8 (17.8)a | 16 (25.8) | 75 (70.8) | 11 (64.7) |
| Total No. | 1,445 | 25 | 45 | 62 | 106 | 17 |
Values are presented as number (%).
FNAC, fine needle aspiration cytology; PTC, papillary thyroid carcinoma; NIFTP, noninvasive follicular thyroid neoplasm with papillary-like nuclear features; AUS, atypia of undetermined significance; NA, nuclear atypia; MF, microfollicles; HC, Hurthle cells.
a
p = .044, Fisher exact test.